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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9539788d92839120736f3ee2df022a3d36a7a6db2a8572ac61dccf9c38f7a6f' 
  AND token = 'x7pVOqS2fPpnkDlKoXrcajIbKxw5ixdVYFIfCpMvcq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}